[3.12] gh-117270: Add missed change to COMPARE_OP from 3.12 to dis documentation (GH-117272) (#117274)

Author: Christopher-Chianelli

Doc/library/dis.rst

@@ -1132,7 +1132,10 @@ iterations of the loop.
 .. opcode:: COMPARE_OP (opname)
 
    Performs a Boolean operation.  The operation name can be found in
-   ``cmp_op[opname]``.
+   ``cmp_op[opname >> 4]``.
+
+   .. versionchanged:: 3.12
+     The cmp_op index is now stored in the four-highest bits of oparg instead of the four-lowest bits of oparg.
 
 
 .. opcode:: IS_OP (invert)